<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta http-equiv="X-UA-Compatible" content="IE=edge">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Document</title>
</head>
<body>
    <script>
     const p1 = new Promise((resolve,reject)=>{
            try{
                console.log('开始获取a');
            // throw new  Error("你错啦")
               
                setTimeout(()=>{
                    console.log('成功');
                    resolve('成功')
                },2000)
                
            }catch(e){
                reject(e.massage)
            }
    })
    const p2 = p1.then((value)=>{
        return new Promise((resolve,reject)=>{
                // resolve('okk')
                // reject('error')

        })
    })
    console.log("p2", p2);
    </script>
</body>
</html>